A gas detector

Abstract

The utility model provides a kind of gas detector, comprising: the shell body consisting of first shell and second shell, the internal cavity of first shell is equipped with first circuit board, the internal cavity of second shell is equipped with second circuit board;The outer surface of first shell is equipped with state indicating device, first circuit board is equipped with processing module and first connector, processing module is connected state indicating device and first connector respectively;The outer surface of second shell is equipped with gas sensor, second circuit board is equipped with the second connector of on-off power supply, RS485 signal line and gas sensor, first connector and second connector are connected.The utility model shell contains cavity space utilization rate is high, circuit board area is reduced, beneficial to miniaturization design, modularization maintenance is convenient, reduce maintenance cost and time.In addition, remote monitoring ability to gas concentration can be realized by RS485 wire harness.

Description

Technical Field

[0001] This utility model relates to the field of gas detection technology, and in particular to a gas detector. Background Technology

[0002] In modern industrial and commercial environments, combustible gas detectors are essential equipment for ensuring production safety and the safety of personnel.

[0003] In the existing technology, there is a type of gas detector that separates the processing chip, gas sensor, and display screen. These gas sensors have problems such as low integration, large space occupation, and complicated installation. Some even do not have a display screen, making it impossible for monitoring personnel to know the real-time gas concentration.

[0004] Another type of traditional combustible gas detector typically integrates all electronic components onto a single circuit board. This can lead to heat dissipation problems, especially when operating in high-temperature environments, potentially negatively impacting the detector's stability and lifespan. Furthermore, the single-circuit board design hinders modular maintenance; if a component fails, the entire circuit board often needs to be replaced, increasing repair costs and time. Additionally, integrating more electronic components to enrich the gas detector's functionality requires a larger circuit board, which is detrimental to miniaturization.

[0005] Furthermore, many existing combustible gas detectors lack RS485 interfaces or other forms of external data transmission capabilities. In scenarios requiring centralized monitoring of multiple locations or devices (such as factories and warehouses), this limitation hinders the effective integration and analysis of information, thus restricting remote monitoring capabilities. Utility Model Content

[0006] To address the aforementioned problems, this invention provides a gas detector, aiming to solve the issues present in the prior art.

[0007] A gas detector includes: a shell body composed of a first shell and a second shell, wherein a first circuit board is installed in the internal cavity of the first shell and a second circuit board is installed in the internal cavity of the second shell;

[0008] The outer surface of the first housing is provided with a status indicator device, and the first circuit board is provided with a processing module and a first connector. The processing module is connected to the status indicator device and the first connector respectively.

[0009] A gas sensor is mounted on the outer surface of the second housing. The second circuit board is equipped with a second connector for connecting the power supply, an RS485 signal line, and the gas sensor. The first connector and the second connector are connected together.

[0010] Furthermore, the processing module includes a main control chip and an RS485 transceiver chip. The RS485 transceiver chip is connected to the first connector and the main control chip, respectively. The main control chip is connected to the status indicator device.

[0011] Furthermore, the outer surface of the first housing is also equipped with a display screen, which is connected to the main control chip.

[0012] Furthermore, the outer surface of the first housing is provided with at least one operation indicator mark, and the first circuit board is provided with an operation detection module. Each operation indicator mark corresponds to an operation detection module, and the operation detection module is connected to the main control chip.

[0013] Furthermore, mounting components for fixing the gas detector to an external object are also provided on the outer surface of the second housing.

[0014] Furthermore, the first housing and the second housing are connected by a rotating opening and closing mechanism, and the opening and closing of the first housing and the second housing are achieved by rotating the opening and closing mechanism.

[0015] Furthermore, the maximum angle at which the first and second housings can be opened by rotating the opening and closing mechanism is not less than 90 degrees.

[0016] Furthermore, the second circuit board is also equipped with a third connector and a fourth connector;

[0017] The third connector connects to an external RS485 signal line, and the third connector and the second connector are connected via the RS485 signal line.

[0018] The fourth connector connects to the gas sensor assembly and the second connector respectively.

[0019] Furthermore, the second circuit board is also equipped with a relay switch, and the third connector is also connected to an external power supply.

[0020] The third connector and the second connector are connected by a power supply line, and a relay switch is installed on the power supply line connecting the third connector and the second connector.

[0021] Furthermore, a grounding terminal is also provided on the outer surface of the second housing.

[0022] The beneficial technical effects of this utility model are as follows: By designing two housings with accommodating cavities, this utility model makes full use of the space within these cavities. One circuit board with data processing and alarm functions, and another circuit board acting as an intermediary for external power transmission, data transmission, and gas sensor monitoring signal transmission, are installed in each housing. These two circuit boards are positioned vertically opposite each other within the detector, facilitating wiring harness connection. The high utilization rate of the housing cavity space and the reduced circuit board area promote miniaturization. The modular circuitry facilitates maintenance, employing a bus-type structure. During operation, only the first and second housings need to be opened for wiring and maintenance, simplifying operation, reducing maintenance costs and time, and improving heat dissipation. Furthermore, this utility model enables real-time communication with external devices via an RS485 wiring harness, achieving remote monitoring, integration, and analysis of gas concentrations. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a gas detector according to the present invention, showing a second circuit board disposed inside the second housing.

[0024] Figure 2 This is a front structural diagram of a gas detector according to the present invention;

[0025] Figure 3 This is a side view of the structure of a gas detector according to the present invention;

[0026] Figure 4 This is a circuit diagram of the operation detection module of a gas detector according to the present invention;

[0027] Figure 5 This is a circuit diagram of a status indication device for a gas detector according to the present invention.

[0028] Figure 6 This is a schematic diagram of the preprocessing circuit for the gas sensor detection signal of a gas detector according to the present invention.

[0029] Figure 7 This is a schematic diagram of the storage circuit of a gas detector according to the present invention;

[0030] Figure 8 This is a schematic diagram of the main control chip circuit of a gas detector according to this utility model;

[0031] Figure 9 This is a schematic diagram of the fifth connector connection circuit of a gas detector according to this utility model;

[0032] Figure 10 , Figure 11 , Figure 13 , Figure 18This is a schematic diagram of the circuit diagram for the first connector of a gas detector according to this utility model.

[0033] Figure 12 This is a schematic diagram of the working voltage generation circuit of the gas sensor of a gas detector according to the present invention.

[0034] Figure 14 This is a schematic diagram of the reference signal generation circuit for a gas detector according to the present invention.

[0035] Figure 15 This is a schematic diagram of the RS485 transceiver circuit of a gas detector according to this utility model;

[0036] Figure 16 This is a schematic diagram of the DC / DC conversion circuit of a gas detector according to the present invention.

[0037] Figure 17 This is a schematic diagram of the voltage stabilizing circuit for a gas detector according to the present invention;

[0038] Figure 19 This is a schematic diagram of the display circuit of a gas detector according to the present invention;

[0039] Figure 20 This is a schematic diagram of the second circuit board of a gas detector according to the present invention;

[0040] Figure 21 This is a schematic diagram of the opening of a gas detector and the disassembly of the sensor assembly according to the present invention.

[0041] in,

[0042] 1-First housing; 11-First circuit board; 12-Status indicator; 13-Display screen; 14-Operation indicator;

[0043] 2-Second housing; 21-Second circuit board; 22-Mounting component; 23-Wire harness adapter;

[0044] 3-Gas sensor assembly; 31-Gas sensor; 32-Sensor mounting and dismounting components; 33-Sensor protective housing;

[0045] 4-Rotating opening and closing parts;

[0046] RY1 - Relay switch;

[0047] 6-Grounding terminal. Detailed Implementation

[0048] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0049] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0050] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0051] See Figure 2 , Figure 3 and Figure 21 The present invention provides a gas detector, comprising: a shell body composed of a first shell (1) and a second shell (2), wherein a first circuit board (11) is installed in the internal cavity of the first shell (1) and a second circuit board (21) is installed in the internal cavity of the second shell (2);

[0052] The outer surface of the first housing (1) is provided with a status indicator device (12), and the first circuit board (11) is provided with a processing module and a first connector. The processing module is connected to the status indicator device (12) and the first connector respectively.

[0053] A gas sensor (3) is installed on the outer surface of the second housing (2). The second circuit board (21) is provided with a second connector for connecting the power supply, RS485 signal line and the gas sensor (3). The first connector and the second connector are connected.

[0054] like Figure 1 As shown, a second circuit board (21) is installed in the internal cavity of the second housing (2). A gas sensor assembly (3) is installed on the outer side wall of the second housing (2). Specifically, a wire harness adapter (23) is also provided on the outer side wall of the second housing (2) for connecting an external power supply line and an RS485 signal line.

[0055] The first shell (1) is the front shell, and the second shell (2) is the rear shell.

[0056] like Figure 2 As shown, specifically, the status indicator (12) is disposed on the outer top surface of the first housing (1).

[0057] RS485, a communication standard widely used in industrial control, supports multi-point, two-way communication, can achieve stable data transmission over long distances, and has strong anti-interference capabilities.

[0058] This invention utilizes two housings with accommodating cavities to fully leverage their space. One accommodating circuit board with data processing and alarm functions, and another acting as an intermediary for external power transmission, data transfer, and gas sensor signal transmission, are installed in each housing. These two circuit boards are positioned vertically opposite each other within the detector, facilitating wiring harness connection. The high utilization rate of the housing cavity space reduces the circuit board area, promoting miniaturization. The modular circuitry facilitates maintenance, and the bus-type structure allows for simple wiring and maintenance by opening both housings, simplifying operation, reducing repair costs and time, and improving heat dissipation. Furthermore, this invention enables real-time communication with external devices via an RS485 wiring harness, allowing for remote monitoring, integration, and analysis of gas concentrations.

[0059] like Figure 8 and Figure 15 As shown, the processing module further includes a main control chip (IC7) and an RS485 transceiver chip (IC6). The RS485 transceiver chip (IC6) is connected to the first connector (CN1) and the main control chip (IC7) respectively. The main control chip (IC7) is connected to the status indicator device (12).

[0060] The RS485 transceiver chip (IC6) receives data from external devices via the RS485 signal line and transmits it to the main control chip (IC7) for processing. The main control chip (IC7) then sends the data to the external devices, enabling data transmission between the gas detector and the external devices and achieving remote monitoring capabilities.

[0061] Furthermore, the outer surface of the first housing (1) is also provided with a display screen (13), which is connected to the main control chip (IC7).

[0062] like Figure 2 As shown, specifically, the display screen (13) is disposed on the outer top surface of the first housing (1).

[0063] Furthermore, the outer surface of the first housing (1) is provided with at least one operation indicator mark (14), and the first circuit board is provided with an operation detection module. Each operation indicator mark (14) corresponds to an operation detection module, and the main control chip (IC7) of the operation detection module is connected.

[0064] like Figure 2As shown, specifically, the operation indicator (14) is set on the outer top surface of the first housing (1). The operation indicator (14), the display screen (13), and the status indicator (12) are reasonably arranged on the outer top surface of the first housing (1) to facilitate the user to view the status indications of the display screen (13) and the status indicator (12) and to set the operation of the gas sensor.

[0065] Specifically, the operation detection module is a Hall switch. The user clicks the operation indicator mark (14) with a magnetic rod, and the corresponding operation detection module transmits the detected user operation to the main control chip for processing. The operation indicator mark (14) can have multiple functions, such as confirm, mode selection, increase, decrease, etc., to realize the adjustment and setting of gas concentration alarm threshold, etc.

[0066] Specifically, the status indicator (12) and operation indicator (14) are arranged around the display screen (13).

[0067] like Figure 1 As shown, further, a mounting component (22) for fixing the gas detector to an external object is also provided on the outer surface of the second housing (2).

[0068] The mounting component (22) includes mounting holes through which it is fixed to an external object. The second housing (2) includes four outer side walls: front, back, left, and right. The mounting component (22), the wiring harness adapter (23), and the gas sensor assembly (3) are all located on different outer side walls of the second housing (2).

[0069] Furthermore, it adopts a bus-type structure, which means that during operation, only the first and second housings need to be opened to connect and maintain the wiring. The operation is simple and convenient, reducing maintenance costs and time, while also improving heat dissipation.

[0070] The back of the second housing (2) is opposite to the object being mounted due to the fixed mounting of the mounting components.

[0071] Furthermore, the first housing (1) and the second housing (2) are connected by a rotating opening and closing member (4), and the opening and closing of the first housing (1) and the second housing (2) are realized by rotating the opening and closing member (4).

[0072] like Figure 3 As shown, the first housing (1) and the second housing (2) are closed by rotating the opening and closing element (4). After closing, as... Figure 2 As shown, the first housing (1) and the second housing (2) are also fixed relative to each other by threaded holes around the perimeter.

[0073] Furthermore, the maximum angle at which the first housing (1) and the second housing (2) are opened by rotating the opening and closing member (4) is not less than 90 degrees.

[0074] like Figure 21 As shown, the first housing (1) and the second housing (2) are opened by more than 90 degrees by rotating the opening and closing part (4). An opening of not less than 90 degrees ensures smooth maintenance of the first circuit board inside the first housing (1) and the second circuit board inside the second housing (2).

[0075] like Figure 1 , Figure 20 As shown, the second circuit board (21) is further provided with a third connector (TB1) and a fourth connector (CN4);

[0076] The third connector (TB1) connects to an external RS485 signal line, and the third connector (TB1) and the second connector (CN2) are connected via an RS485 signal line.

[0077] The fourth connector (CN4) is connected to the gas sensor assembly (3) and the second connector (CN2). Figure 1 As shown, the second circuit board is further equipped with a relay switch (RY1), and the third connector (TB1) is connected to an external power supply.

[0078] The third connector (TB1) and the second connector (CN2) are connected by a power supply line, and a relay switch (RY1) is installed on the power supply line connecting the third connector (TB1) and the second connector (CN2).

[0079] Further, see Figure 3 The outer surface of the second housing (2) is also provided with a grounding terminal (6).

[0080] Furthermore, the gas sensor assembly (3) includes, from the inside out, a gas sensor (31), a sensor mounting / unmounting component (32), and a sensor protective housing (33). A connection interface is provided on the outer wall of the second housing. The sensor mounting / unmounting component (32) of the gas sensor (31) is connected to the connection interface on the outer wall of the second housing to fix the gas sensor (31) to the side wall of the second housing. Specifically, the sensor mounting / unmounting component (32) has a built-in cavity, and the gas sensor (31) is located within this cavity. A through-hole is provided on the side wall of the sensor mounting / unmounting component (32) to allow gas to enter the gas sensor (31). The sensor protective housing (33) protects the gas sensor (31).

[0081] As shown in the circuit schematic of this utility model, Figures 4-20 As shown, GND represents ground. Figure 4-19 This is the circuit schematic of the first circuit board. Figure 20 This is the circuit schematic of the second circuit board.

[0082] Figure 4The circuit diagram of the gas detector's operation detection module is shown.

[0083] C1, C2, C3, and C4 are capacitors, V3 is the third voltage, and MRS1, MRS2, MRS3, and MRS4 belong to four operation detection modules that detect the operator's actions. Specifically, MRS1, MRS2, MRS3, and MRS4 are model BU52092GWZ-E2, which are Hall switches. Each Hall switch corresponds to an operation indicator mark (14) on the top surface of the first housing. When the magnetic rod operation is detected, a magnetic rod operation signal is sent to the main control chip (IC7). Through the operation detection module, the gas detector can be parameter-set. CPU-PIN43 indicates connection to pin 43 of the main control chip (IC7), CPU-PIN37 indicates connection to pin 37 of the main control chip (IC7), CPU-PIN42 indicates connection to pin 42 of the main control chip (IC7), and CPU-PIN41 indicates connection to pin 41 of the main control chip (IC7).

[0084] Figure 5 This is a circuit diagram of the status indication device for a gas detector.

[0085] Q9, Q10, and Q11 are transistors; R52, R52, and R53 are resistors; and V3 is the third voltage. The status indicator is connected to the main control chip (IC7). The status indicator includes three status lights: a fault indicator, a power indicator, and an alarm indicator. Specifically, these are LEDs: LED1 displays yellow to indicate a gas detector malfunction; LED2 displays green to indicate power is on; and LED3 displays red to indicate that the gas concentration exceeds the limit. CPU-PIN36 connects to pin 36 of the main control chip (IC7), CPU-PIN22 connects to pin 22 of the main control chip (IC7), and CPU-PIN16 connects to pin 16 of the main control chip (IC7).

[0086] Figure 6 This is a schematic diagram of the preprocessing circuit for the gas detection signal of the gas sensor component of a gas detector.

[0087] CPU-PIN29 connects to pin 29 of the main control chip (IC7), CPU-PIN1 connects to pin 1 of the main control chip (IC7), CPU-PIN2 connects to pin 2 of the main control chip (IC7), and CPU-PIN30 connects to pin 30 of the main control chip (IC7). SensorSignal represents the gas detection signal of the gas sensor assembly, and RegSignal represents the reference signal. R5, R6, R54, R7, R8, R11, R10, R14, and R15 represent resistors. C29, C6, C7, C10, C30, and C11 represent capacitors. V3 represents the first voltage, V4 represents the fourth voltage, and V5 represents the fifth voltage. IC1A and IC1B are operational amplifiers, model NJU7043RB1. SensorSignal is processed by IC1A and IC1B sequentially before being transmitted to the main control chip (IC7). IC3 is a digital potentiometer, model AD5246BKSZ100-RL7, which is an I2C-compatible 128-tap digital potentiometer.

[0088] Figure 7 This is a schematic diagram of the storage circuit of a gas detector according to the present invention.

[0089] IC9 is a memory chip, model BR24G1MF-3AGTE2, an electrically erasable programmable read-only memory (EEPROM). R60, R61, and R62 are resistors, C28 is a capacitor, and V3 is the third voltage. CPU-PIN23 connects to pin 23 of the main control chip (IC7), CPU-PIN1 connects to pin 1 of the main control chip (IC7), and CPU-PIN2 connects to pin 2 of the main control chip (IC7).

[0090] Figure 8 This is the circuit diagram of the main control chip for the gas detector.

[0091] The main control chip (IC7) is model R5F100GGAFB. V3 is the third voltage, V4 is the fourth voltage, C31, C26, and C27 are capacitors; R64 and R65 are resistors. X1 is model CSTNE9M83G520000R0, which is a ceramic crystal oscillator.

[0092] Figure 9 This is a schematic diagram of the fifth connector circuit for a gas detector.

[0093] The fifth connector (CN5) is mainly used for software programming of the main control chip and is not used during the actual use of the gas detector. Its model number is B6B-ZR-SM4-TF-T(LF,SN). R46, R47, R48, R49, and R50 are resistors. CPU-PIN18 connects to pin 18 of the main control chip (IC7), CPU-PIN19 connects to pin 19 of the main control chip (IC7), CPU-PIN39 connects to pin 39 of the main control chip (IC7), and CPU-PIN40 connects to pin 40 of the main control chip (IC7). V3 is the third voltage.

[0094] Figure 10 , Figure 11 , Figure 13 , Figure 18 The schematic diagram shows the connection of the first connector (CN1) of the gas detector to the relevant circuit.

[0095] Figure 10 In this diagram, SensorSignal is the gas detection signal output by the gas sensor assembly; RegSignal is the reference signal; SensorVolt is the operating voltage generated by the gas sensor assembly; CN1 is the first connector, model B10B-ZR-SM4-TF-T(LF,SN); C5 is a capacitor; and V1 is the voltage. The first connector, acting as a connector for the first circuit board, receives the gas detection signal, power supply voltage, and RS485 input data from the second circuit board, and transmits the RS485 output data and the operating voltage of the gas sensor assembly to the second circuit board.

[0096] Figure 11 In the diagram, R1 is a resistor, C8 is a capacitor, and V4 is the fourth voltage. CPU-PIN27 indicates that it is connected to pin 27 of the main control chip (IC7).

[0097] Figure 13 In the diagram, Q2 represents a transistor, and CPU-PIN33 indicates that it is connected to pin 33 of the main control chip (IC7).

[0098] Figure 18 In the diagram, C9 is a capacitor, R12 and R13 are resistors, V1 is the first voltage, and CPU-PIN26 indicates that it is connected to pin 26 of the main control chip (IC7).

[0099] Figure 12 This is a schematic diagram of the circuit for generating the working voltage of the gas sensor in a gas detector.

[0100] IC2B is an operational amplifier, model NJU7043RB1. R2, R17, R18, R19, and R20 are resistors; C14 and C15 are capacitors; Q1 is a MOSFET; V3 and V4 are the third and fourth voltages, respectively; SensorVolt is the operating voltage provided for the gas sensor assembly. CPU-PIN15 indicates connection to pin 15 of the main control chip (IC7). CPU-PIN28 indicates connection to pin 28 of the main control chip (IC7).

[0101] Figure 14 This is a schematic diagram of the reference signal generation circuit for a gas detector.

[0102] IC2A is an operational amplifier, model NJU7043RB1. C12 and C13 are capacitors, R9 and R16 are resistors, RegSignal is the reference signal, and V4 is the fourth voltage. CPU-PIN5 indicates that it is connected to pin 5 of the main control chip (IC7).

[0103] Figure 15 This is a schematic diagram of the RS485 transceiver circuit for a gas detector.

[0104] IC6 is an RS485 transceiver chip, model number SN65HVD75DGKR, mainly used for RS485 data transmission and reception. R35, R36, R37, R38, R39, and R40 are resistors; C32, C33, C34, and C35 are capacitors; V3 is the third voltage. CPU-PIN34 connects to pin 34 of the main control chip (IC7), CPU-PIN38 connects to pin 38 of the main control chip (IC7), and CPU-PIN35 connects to pin 35 of the main control chip (IC7).

[0105] Figure 16 This is a schematic diagram of the DC / DC conversion circuit for a gas detector.

[0106] IC5 is a DC / DC converter chip, model NJM2374AE(TE1), which converts the first voltage V1 into the third voltage V3, the fourth voltage V4, and the fifth voltage V5, providing power to various circuits. R21, R22, R23, R24, R25, and R26 are resistors; C16, C17, C41, C18, C20, and C21 are capacitors; L1 is an inductor; D2 is a Schottky diode, model RB160M-40TR; and ZD1 is a Zener diode, model KDZVTR4.7B.

[0107] Figure 17 This is a schematic diagram of the voltage regulator circuit for a gas detector.

[0108] IC4 is a linear regulator chip, model AS78L12RTR-G1. C40 and C19 are capacitors; V1 and V2 are the first and second voltages, respectively.

[0109] Figure 19 This is a circuit diagram of the display screen of a gas detector.

[0110] SEG1, SEG2, SEG3, and SEG4 are digital displays, model LF-3011VA, an LED digital display. Q3, Q4, Q5, Q6, Q20, Q21, Q22, Q23, Q24, Q25, Q26, and Q27 are transistors, and R27, R28, R29, R30, R31, R32, R33, and R34 are resistors. CPU-PIN6 connects to pin 6 of the main control chip (IC7), CPU-PIN7 connects to pin 7 of the main control chip (IC7), CPU-PIN8 connects to pin 8 of the main control chip (IC7), CPU-PIN9 connects to pin 9 of the main control chip (IC7), CPU-PIN10 connects to pin 10 of the main control chip (IC7), CPU-PIN11 connects to pin 11 of the main control chip (IC7), CPU-PIN12 connects to pin 12 of the main control chip (IC7), CPU-PIN13 connects to pin 13 of the main control chip (IC7), CPU-PIN14 connects to pin 14 of the main control chip (IC7), CPU-PIN24 connects to pin 24 of the main control chip (IC7), and CPU-PIN25 connects to pin 25 of the main control chip (IC7).

[0111] Figure 20This is the circuit diagram of the second circuit board for the gas detector. L3 and L2 are inductors; C51, C52, C53, C56, C57, C58, and C59 are capacitors; and R70, R71, and R72 are resistors. D1 is a fast / ultra-fast recovery diode, model HS2MA. D4 is a Schottky diode, model RB160L-40TE25; D3 is a high-speed switching diode, model 1N4148W-GOOD-ARK. CN2 is the second connector, model B10B-ZR(LF)(SN); TB1 is the third connector, model 255-404; CN4 is the fourth connector, model B4B-XH-A(LF)(SN); CN6 is the sixth connector, model A2502-WV02; and RY1 is a relay, model HF33F / 024-HS3. F1 is a resettable fuse, model MF-SM030-2-99; F3 and F4 are fuses, model RF1346-000. PE is protective ground. FB1 and FB2 are ferrite beads, model BLM15HD182SN1D. DSW1 is a DIP switch, model DS-01RP. TVS1 is a transient voltage suppressor diode, model CDSOT23-SM712. ZD2, ZD3, and ZD4 are Zener diodes, model UDZVTE-175.6B. VRD1 is a bidirectional diode, and SA1 is a varistor.

[0112] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A gas detector, characterized in that, include: A shell body is composed of a first shell and a second shell, wherein a first circuit board is installed in the internal cavity of the first shell and a second circuit board is installed in the internal cavity of the second shell; The outer surface of the first housing is provided with a status indicator device, and the first circuit board is provided with a processing module and a first connector, the processing module being connected to the status indicator device and the first connector respectively; A gas sensor assembly is mounted on the outer surface of the second housing. The second circuit board is provided with a power supply, an RS485 signal line, and a second connector for the gas sensor assembly. The first connector and the second connector are connected.

2. A gas detector as described in claim 1, characterized in that, The processing module includes a main control chip and an RS485 transceiver chip. The RS485 transceiver chip is connected to the first connector and the main control chip, respectively. The main control chip is connected to the status indicator device.

3. A gas detector as described in claim 2, characterized in that, The outer surface of the first housing is also provided with a display screen, which is connected to the main control chip.

4. A gas detector as described in claim 3, characterized in that, The outer surface of the first housing is also provided with at least one operation indicator mark, and the first circuit board is provided with an operation detection module. Each operation indicator mark corresponds to one operation detection module, and the operation detection module is connected to the main control chip.

5. A gas detector as described in claim 1, characterized in that, The outer surface of the second housing is also provided with mounting components for fixing the gas detector to an external object.

6. A gas detector as described in claim 1, characterized in that, The first housing and the second housing are connected by a rotating opening and closing mechanism, which enables the opening and closing of the first housing and the second housing.

7. A gas detector as described in claim 6, characterized in that, The maximum angle at which the first housing and the second housing are opened by the rotating opening and closing mechanism is not less than 90 degrees.

8. A gas detector as described in claim 1, characterized in that, The second circuit board is also provided with a third connector and a fourth connector; The third connector is connected to an external RS485 signal line, and the third connector and the second connector are connected via an RS485 signal line. The fourth connector is connected to the gas sensor assembly and the second connector, respectively.

9. A gas detector as described in claim 8, characterized in that, The second circuit board is also equipped with a relay switch, and the third connector is also connected to an external power supply. The third connector and the second connector are connected by a power supply line, and the relay switch is provided on the power supply line connecting the third connector and the second connector.

10. A gas detector as described in claim 8, characterized in that, The outer surface of the second housing is also provided with a grounding terminal.

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